pdfdetach: add page (#14112)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/pdfdetach.md

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+# pdfdetach
+
+> List or extract attachments (embedded files) from a PDF file.
+> See also: `pdfattach`, `pdfimages`, `pdfinfo`.
+> More information: <https://manned.org/pdfdetach>.
+
+- List all attachments in a file with a specific text encoding:
+
+`pdfdetach list -enc {{UTF-8}} {{path/to/input.pdf}}`
+
+- Save specific embedded file by specifying its number:
+
+`pdfdetach -save {{number}} {{path/to/input.pdf}}`
+
+- Save specific embedded file by specifying its name:
+
+`pdfdetach -savefile {{name}} {{path/to/input.pdf}}`
+
+- Save the embedded file with a custom output filename:
+
+`pdfdetach -save {{number}} -o {{path/to/output}} {{path/to/input.pdf}}`
+
+- Save the attachment from a file secured by owner/user password:
+
+`pdfdetach -save {{number}} {{-opw|-upw}} {{password}} {{path/to/input.pdf}}`